Transcript
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1. Correction of the present location and distance A correction is necessary in the following situations: • When changing a tire: perform an automatic correction (Distance correction) Also, a correction can also be made in the following situations. • When the vehicle position mark
appears in a location different from the actual present
location (the vehicle position mark is misaligned), the vehicle position mark position and direction can be corrected. (Present location correction) • When the progression of the vehicle position mark
on the map and the actual
progression of the vehicle while driving: the vehicle position mark corrected. (Distance correction)
progression can be
However, even if the vehicle position mark on the map is misaligned, continue driving for a moment and the present location will be automatically corrected using map matching and GPS data. (Depending on the case, this may take several minutes.) In the event the device does not use GPS data and the present location is not automatically corrected, park the vehicle in a safe area and perform present location correction.
Present location correction
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Touch Touch
Adjust for Calibration.
Touch
Position/Direction .
Setup in the Menu screen.
Touch
.
• Move to the actual position of the present location on the map.
Touch
Enter .
Set the direction. • To move the direction counterclockwise, touch it clockwise, touch
Enter .
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Touch
. To move
.
Maps with a scale of 1 mile or greater detail can be corrected.
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1. Correction of the present location and distance Correcting the distance
Touch Touch
Adjust for Calibration.
Touch
Tire Change .
Setup in the Menu screen.
• Automatic correction is performed. • The touch switch turns brighter during automatic correction. • Using GPS data, the correction will automatically be completed after driving a moment and the touch switch will turn back to blue.
• The device performs automatic distance correction (automatic correction) using GPS and vehicle speed signals. This may be delayed in the event of a sharp deviation that overwhelms the automatic correction function (changing a tire, being towed by another vehicle, etc.) In such a case, drive about 6 miles along a road indicated by favorable GPS signal reception conditions. • If correction is impossible, have the device inspected at the store of purchase. • During automatic correction, the vehicle position may be misaligned. • Even if the automatic correction is complete, because the distance correction has a learning function, there may be variations in the progression of the vehicle position mark
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depending on the driving conditions.
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2. Map DVD-ROM data The information on the map DVD-ROM can be viewed. The figure below is merely an example. The displays may vary depending on the type of map DVD-ROM and when it was made.
Map DVD-ROM data display
Touch
Map DVD in the Menu
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screen.
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3. Accuracy and error Positioning accuracy The GPS is a very accurate satellite controlled by the U.S. Department of Defense. Errors may result due to the occurrence of a multipath caused by reflections off buildings or other structures.
GPS signal quality and reception conditions Any obstruction coming between the satellite and the GPS antenna will disrupt signal reception from the satellite. Also, 3 or more signals must be received simultaneously to enable positioning. When driving along locations such as those shown below, GPS positioning is not possible. In addition, obstructions placed on or near the GPS antenna (such as a load) will disrupt signals from the satellite. • Because the GPS satellite orbits the earth, signal reception conditions may vary depending on the position of the satellite even if driving in the same area. Signals from a satellite orbiting near the horizon are more likely to be obstructed. • The GPS satellite is controlled by the U.S. Department of Defense and can be deliberately made to lose positioning accuracy.
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Underground, in a tunnel or in an indoor parking structure
Surrounded by obstructions such as tall buildings
Densely wooded areas
Under an elevated road
In a building
On a cliff side road or at a cavern opening
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Under the following conditions, make sure to install the GPS antenna in the position indicated in the instruction manual for your vehicle model. • If the noise emitted from another electrical device diminishes signal reception. • If this device may represent an obstruction to the proper operation of airbags. • If the satellite signal received from the side or rear of the vehicle is diminished because of a windshield pillar or roof panel.
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3. Accuracy and error Present location display error In order to find the exact position of the present location, this device uses compiled data from the GPS satellite, vehicle speed sensor and vibration gyro sensor. Because each of these contains a margin of error, the present location indicated may not coincide with your actual positioning. If the indication is different from the actual positioning, the present location displayed can be corrected. Park the vehicle in a safe place first before proceeding.
Error due to having changed a tire The device calculates the distance traveled by the vehicle using a speed sensor (in proportion to the tire rotation). The following situations would result in a significant error that may render proper present location positioning impossible. • When using a sub-standard tire • When driving on a snow covered, gravel road or any slippery road • When the tire air pressure is incorrect • When using new tires (the distance correction coefficient setting can be changed and adjusted)
Correcting the map matching vehicle position sensor Map matching is a system that compares present location positioning data from the GPS and other sources with information concerning all the roads driven on until now in order to correct the present location onto the most appropriate road. This device corrects the present location data compiled from a combination of independent navigation and satellite navigation and matches it with the shape of the road. However, there may be instances when the present location error cannot be avoided and the position indicated on the map does not coincide with your actual positioning even after a correction using map matching. Also, driving along a road whose actual shape differs from the map data may result in a vehicle position mark misalignment.
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Actual path taken Path taken as per sensor data Screen display, correction by map matching
Present location display, route guidance accuracy
The present location appears on a road running parallel to the road taken.
When turning on a road forking into two roads making a "Y" shape, the present location appears on the other road.
When making a turn, the present location appears on the road just before or after the road turned on.
The present location appears misaligned when driving on steep roads.
The present location appears misaligned when driving on a continuous curve in the same direction.
The present location appears misaligned when meandering such as changing lanes.
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The following situations are not malfunctions but merely some examples where inaccurate present location positioning and/or route guidance occurs depending on the road and driving conditions.
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3. Accuracy and error
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The present location appears misaligned when the vehicle is rotated on a parking structure turntable with the ACC turned OFF.
The present location appears misaligned when driving on a snowbound or slippery road or when using tire chains.
When the vehicle is moved by ferry or a means other than being driven, the GPS positioning will indicate a present location on the spot where the vehicle was prior to being moved.
When route guidance indicates a road that is actually blocked off (regular traffic prohibited).
The present location appears misaligned when turning back.
When having changed a tire(s), the vehicle position mark may be misaligned.
Road and geographic name data The roads and geographic names are subject to change after the compilation of the map database and may differ from the actual roads and names.
Route guidance
When having turned on an intersection that is not part of the route guidance, there may be an error in the voice guidance instructions.
When searching for a route, the route provided may include a detour.
The route guidance may instruct a U-turn.
Transit point
When driving on a straight road, the route guidance may instruct you to go straight (in cases where the shape of intersections is difficult to determine).
No route guidance may occur even if turning at an intersection.
When driving towards the destination without passing through a transit point, the device may reinitiate a route search and provide a new route that takes you towards that transit point.
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Search reinitiated
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3. Accuracy and error G1
G2
When searching for a route, the route display may not appear in time for the next turn.
Route search
In case of multiple destinations, when having bypassed the next destination, a route search is reinitiated to provide a route returning to it.
While providing guidance on where you are headed, several geographical names may be indicated.
Search
G1
G2
Drive following the actual traffic regulations.
• The time it takes the device to reinitiate a route search while driving on a highway may be lengthy. • When correcting the present location mark manually and then driving under conditions where the positioning is not corrected, the position will not be properly indicated. • The route may not change even if reinitiating a search. • If having set a present location, destination or transit point on a remote island or in an area where there are no guidable roads, the device may not search for a route. • The device may not search for a route if the present location and the destination are in close proximity. • The route guidance will not necessarily recommend toll roads even if having selected to prioritize toll roads in the search conditions. Similarly, even if having selected not to prioritize toll roads, a route using toll roads may be displayed. (The "Prioritize/Do not prioritize toll roads" setting enables the prioritization of either toll roads or local roads when a selection of one is made possible.)
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